1.

If int_(0)^(alpha)(dx)/(1-cos alpha cosx)=(A)/(sin alpha)+B(alpha ne 0), then possible values of A and B are

Answer»

`A=(pi)/(2), B=0`
`A=(pi)/(4), B=(pi)/(4sinalpha)`
`A=(pi)/(6), B=(pi)/(sinalpha)`
`A=pi, B=(pi)/(sinalpha)`

ANSWER :A::B


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